MCQs on Catalyst and Catalysis

MCQs on Catalyst and Catalysis

1. Which of the following is incorrect for a catalyst?

(a) Bio-chemical reactions are mostly catalysed by enzymes

(b) Catalyst does not start a reaction

(c) Catalyst changes the equilibrium constant of a reaction

(d) Co-enzymes increase the activity of an enzyme

Answer: (c)

2. How does a catalyst increase the rate of a reaction?

(a) By forming an intermediate complex

(b) By increasing activation energy

(c) By lowering the activation energy

(d) By changing equilibrium constant

Answer: (c)

3. Which of the following is used as a catalyst in the contact process?

(a) V₂O₅

(b) Fe₂O₃

(c) Ag₂O

(d) SO₃

Answer: (a)

4. Which of the following is known as Lindlar’s catalyst?

(a) Na in liquid NH₃

(b) Pt in ethanol

(c) Pd with BaSO₄

(d) Ni in ethanol

Answer: (c)

5. Which of the following enzymes catalyses the hydrolysis of triglycerides to fatty acids and glycerol?

(a) Pepsin

(b) Maltase

(c) Zymase

(d) Lipase

Answer: (d)

6. Ziegler Natta catalyst is associated with

(a) polymerisation of alkenes

(b) hydrogenation of alkenes

(c) hydroformylation of alkenes

(d) none of the above

Answer: (a)

7. What is the effect of enzymes on the rate of biochemical reactions?

(a) The rate increases

(b) It does not change

(c) The rate decreases

(d) either (b) or (c)

Answer: (a)

8. Which of the following is used as a catalyst in the lead chamber process?

(a) Nitrogen oxides

(b) Pt

(c) Ni

(d) V₂O₅

Answer: (a)

9. Which of the following is changed in a chemical reaction due to a catalyst?

(a) Internal energy

(b) Entropy

(c) Enthalpy

(d) Activation energy

Answer: (d)

10. Which of the following is incorrect for enzymes?

(a) Enzymes are specific

(b) Most of the enzymes are protein

(c) Reactivity of enzymes is least at optimum temperature

(d) High temperature and UV rays can denature enzymes

Answer: (c)